Centerless truing machine



Sept. 25, 1951 F. M. ROSAZ CENTERLESS TRUING MACHINE l7 Sheets-Sheet 1 Filed April 18, 1949 I INVENTOR TranQq/s Marius R0333- BY W A'H'or'n Sept. 25, 1951 F. M. ROSAZ 2,568,825

CENTERLESS TRUING MACHINE Filed April 18, 1949 17 Sheets-Sheet 2 g INVENTORK angois Mar/us $2 58.1-

BY/ MW W Sept. 25, 1951 F. M. ROSAZ 2,568,825

CENTERLESS TRUING MACHINE Filed April 18, 1949 17 Sheets-Sheet 5 Sept. 25, 1951 F. M. RosAz I CENTERLE'SS TRUING MACHINE l7 Sheets-Sheet 4 Filed April 18, 1949 INVENTOR: 7; gen Marius QOSaIZ "742M4 MO F'n Sept. 25, 1951 F. M. ROSAZ CENTERLESS TRUING MACHINE 1'7 Sheets-Sheet 5 Filed April 18, 1949 INV F. M. ROSAZ CENTERLESS TRUING MACHINE Sept. 25, 1951 17 SheetsSheet 6 Filed April 18, 1949 NTOR:

INV 730mg 016 Mar/U6 Sept. 25, 1951 F. M. ROSAZ 2,568,825

CENTERLESS TRUING MACHINE Filed April 18, 1949 17 Sheets-Sheet 7 Sept. 25, 1951 F. M. ROSAZ 2,563,825

CENTERLESS TRUING MACHINE Filed April 18, 1949 17 Sheets-Sheet 8" FIG. 75 r (o X 00 INV NTOR:

o) 8 Fan Mar/w 0522 BY/Mm Sept. 25, 1951 F. M. ROSAZ CENTERLESS TRUING MACHINE l7 Sheets-Sheet 9 Filed April 18, 1949 INVEN TOR:

n c olS MCI/I05 Q0532 Wornw P 1951 F. M. RosAz CENTERLESS TRUING MACHINE 1'7 Sheets-Sheet 10 Filed April 18, 1949 INVENTOR:

, Mama I'll llll llfl llllllllllllllll mi 9. 9 WW AFIAE 0 Akw a Se t. 25, 1951 ROSAZ 2,568,825

CENTERLESS TRUING MACHINE Filed April 18, 1949' l7 Sheets-Sheet 11 a; 3! 1|] in A. ...A 7 m 7 Sept. 25, 1951 F. M. ROSAZ CENTERLESS TRUING MACHINE l7 Sheets-Sheet 12 Filed April 18, 1949 Sept. 25, 1951 F. M. ROSAZ CENTERLESS TRUING MACHINE Filed April 18, 1949 17 Sheets-Sheet l5 0 a m m w M m v W mv. B m r7 Sept. 25, 1951 F. M. ROSAZ CENTERLESS TRUING MACHINE 17 Sheets-Sheet 14 Filed A ril 1 8, 1949 JNVENTOR: Fi-engo/s Her/us @05612 "7 W A-H-o maul Sept. 25, 1951 F, M RQSAZ 2,568,825

CENTERLESS TRUING MACHINE Filed April 18, 1949 17 Sheets-Sheet l5 Trango/s Mar/w R058 L BY jfldm- A-H'OF n y Sept. 25, 1951 F. M. ROSAZ CENTERLESS TRUING' MACHINE Filed April 18, 1949 E 'QQZ 124 ///fi V/// l7 Sheets-Sheet l6 INVENTOR:

fizz/1 0013 Mar/v.5 2

j/Mm- A'H'ornay Sept. 25, 1951 F. ROSAZ CENTERLESS TRUING MACHINE Filed April 18, 1949 17 Sheets-Sheet l7 l "llllllllllllllllllll NNN - INVENTOR: Fang/'5 Mar/us Q0582.

2- W kH'orhw.

fatented Sept.

nw sl a iu slies aihi tienn France assignor to Microrex, Saint-Etienne, France, a

French eampafiy Application'April18, 1949, Serial No. 88,141

r In France April 30, 1948 8'Claiin's. (01. 51-103) Centreless truing adds to the advantages of a high degree of accuracy in work of this kindan increase in the rate of production in comparison with a methodof truing as carried out between centres such as used in normalpractice. k The centreless truing machines, in which this system oi truing is adapted, in order to enable accurate work to be performed in a thoroughly satisfactory manner, must be provided with parts that are turned out and setin place with great care, thusensuring the greatest exactitude and the certainty that high precision will be maintained, in addition to simplicity in handling and controlling the various parts, that is absolutely essential for the smooth running of this method of truing. As'an answer to such demands, an improved type of centreless machine has been designed as described hereinafter.

Fora clear definition of these improvements without howeverimposing any restrictions o'n'th scope of the invention, accompanying drawings illustrate by way of example'a preferred embodiment of my invention. In said drawings: 7,

Figure 1 shows on a' reduced scale an elevatio'na-l' frontal view of the improved centrelss truing machine.

Figure 2 shows on a reduced scale an eleval tional assembly View ofthe rear of the centreles's truing machine. A I

Figure 3 showson a reduced scale a of the assembly of the centrele'ss' truing machine. 7

Figure 4 represents on a reduced's'cale a sectionalvie'w of the setting of the abrasive wheel on its hub and'the spindles.

Figure 5 shows one; reduced scale a sectional view of the said assembly'for the setting'of the driving abrasive wheel on its hub and thespindle's. I

Figure 6 shows on a reduced scale a part out side" and side view of the assembly of' the ma chine illustrating the control device for the car: riag'e of the driving-grinding wheel and the control'of the dipping and ejection means.

Figure 7 is a part view turned sideways'corresponding to Figure 6.

Figure 8 is a plan partly sectional view taken along the lines ab (Figure 6) and b c (Figure' 9) corresponding to Figure 6 Figure 9 is'a' sectional view alo gthe line" d--'e (Figure 8') and corresponding" to Figure 8.

Figure 10 is ja sectional view along the 11m; f g'f;(Figure 8), corresponding to Figure 8. v

(v Figure 11' show's'on'a' reduced scale" an outer from" View or the" gear bo3i enabling -to be carried" out" in cdmtination with the speedchanger with a view to adjusting the speed of the driving wheel while running.

Figure 12 shows on a reduced scale and in elevation a section of the gear-box taken along the line hi (Figure 13).

Figure 13 shows a plan partly sectional view along j-k (Figure 12), corresponding to Figure 12. V

Figure 14 shows on a reduced scale an outer elevational view of the guide-rests of which use is made for successive continuous truing operations'. The dotted outline shows the adjustment of the rests for a successive truing of work pieces of small diameter.

Figure 15 is an outer side view, corresponding to Figure 14, of the guide-rests.

Figure 16 shows on a reduced scale, in a sectional view through Zm (Figure 1), the control through differential pinions provided for raising the guide-bars as well as the supporting spindle of the guide-rests. The dotted line shows a'change in position of the lifting cams and the corresponding position of the lifting rods of the guide bar.

Figure 17 shows on a reduced scale and in section along line n0 (Figure 18) the device used as a stop for the work and constituting an ejector that is set on the machine for truing through intermittent operation of shoulder pieces. The

' dotted line shows the pawl and the actuating front view of the speed-change control.

Figure 22 is a sectional view along v-w (Figure 21) corresponding to Figure 21.

Figure 23 shows on a small scale, an elevational and sectional view along :c-y (Figure 24) of the arrangement for the setting of the truing abrasive wheel.

Figure 24 is a sectional view along a'b (Figure .23), corresponding to Figure 23.

Figure 25 is a part sectional View along c'-d (Figure 23) Figure 26 shows on a small scale an elevational and sectional view along" e'f' (Figure 27), of the arrangement for setting the driving wheel.

Figure 27 is a sectional viewalohgg"h' (Figur'"26), corresponding to Figure 26.

Figure 28 is an outer plan view corresponding to Figure 27 showing the arrangement for the sloping of the setting device through movement of the bed-plate.

Figure 29 shows on-a small scale, an outer elevational view of the tightening means for the chain that controls the abrading wheel.

Figure 30 is a partly sectional plan view along line z"y" of Figure 29.

Figure 31 shows on a small scale, an outer elevational view of the tightening device for the belts driving the truing abrasive wheel.

Figure 32 is a sectional view along lcl (Figure 31) and on a larger scale of the tightening device.

Figure 33 shows on a small scale, an outer view, partly in section of the derrick for hoisting and quick handling of the abrasive wheels.

Figure 34 is an outer side view corresponding to Figure 33.

My improved centreless truing machine includes chiefly:

1. A frame I that is strongly ribbed and the body of which contains a supply of water for spraying during truing or setting operations. This frame carries on its upper portion dovetailed slides 2-43 on which move respectively: the carriage d of the truing abrasive wheel 5 and the carriage 6 of the driving wheel 1. These slides 23 are raised with reference to the abrasive wheels 5 and l, so as to protect them and shelter them from abrasive materials and from the spraying liquid, this is a safeguard of prime importance since the good condition and the protection of the slides ensure satisfactory operation and accuracy that are essential for these machines. This frame is provided also with raised portions on which are fastened the control-boards, inspection holes, motors, gear-box and other control arrangements for the abrasive wheels, for the movement of carriages, grinding, spraying, raising of the grindingwheels, etc. that make this truing machine a perfectly self contained unit.

2. A working-head supporting the spindles of the truing abrasive wheel 5 (Figure 4). This is a delicate part of the machine that must be turned out with a high degree of precision and set faultlessly so as to ensure precision work. For that reason, the truing abrasive wheel 5 is clamped and centered between the cheek plates 8 and 8' connected together by the tightening screws 9; these cheek plates and consequently the grindingwheel therewith are fastened on the hub IE3 by the keys H; two clamping nuts I2 with nut-locks are screwed on the ends of the hub l9 and act against the cheek plates, thus enabling together with the clamping, the side adjustment of the position of the abrasive wheel to be carried into effect. At the end of the hub and in holes drilled therein are housed two sockets or spiders l3 and I3 with a tapered entry that enables the abrasive wheel and hub assembly to be centered and to bear on the nose end of the spindles l4 and I5 having the same taper. These spindles are centrally positioned and carry by means of ball-bearings, counter-cheeks It for taking up side stresses, said counter-cheeks held in ball-races I! that are themselves set in borings of the carriage 4 that moves on the slides 2 of the frame. The spindle i5 is finished off by a fluted bearing surface on which is positioned and fastened by the nut iii the driving pulley l9 shaped to take trapezoidal belts; At the other end the spindle l5 has passed through it a catch-pin 20 also housed in two notches of the hub [0 which causes the wheel and spindle l5 or driving spindle. passes entirely and freely through the spindle l4 4 hub assembly to revolve as" one piece with the A central bolt 2| along its axis in order to be screwed in the end of the spindle IS; the head of this central bolt bears on the end of the spindle l4 and by screw ing up tightly locks the wheel-hub assembly between the conical nose ends of the spindles without for that reason giving rise to stresses out of the ordinary on the ball-races of which the adjustment for picking up any play is carried out by nuts 22; the opposing side thrusts being takenup, as stated above, by the precision counter cheeks [6. Finally, carefully located joints keep any dust and other upsetting influences away from the machine parts.

3. A driving head carrying the spindles of the driving abrasive wheel I (Figure 5), that shows a certainv number of salient assembly features similar to those of the working head, especially the assembly of the abrasive wheel between cheek plates keyed on a hub in which are housed sockets or spiders that are centered and bear on the tapered nose-shaped ends of the two spindles, the tight clamping of the wheel and hub assembly between these tapered nose-shaped ends through a central bolt without any abnormal stresses on the bearings, the side stresses being taken up in this vase by opposed taper roller bearings 23, the keying and fastening to the end of the driving spindle of a driving pinion 61 that engages a chain, the driving spindle carrying at the other end two fingers 24 engaged in'the notches of the hub and driving the hub-wheel assembly. However in this case the spindles are centered and carried by means of roller-bearings in the bearing casings 24- that are themselves set in the bored-out portions of the bearings 25 of a halfround ribbed cradle 26. The latter forms bearings cut out by slots 21 through which pass bolt and nut systems that may thus fasten at the required slope this cradle on the driving carriage 6 sliding on the slideways 3.

4. An arrangement of combined controls of the driving carriage 5, of the control of the intermittent operation in the case of truing of shouldered pieces and of the control of the ejection of the work pieces in the case of truing by intermittent operation (Figures 6, 7, 8, 9, 10, 17, 18). This arrangement is located at the end of the frame I on the side corresponding to the driving abrasive wheel. It is provided with a lever 28 showing a long working handle and keyed on the eccentric shaft 29 running in shouldered and bushed bearings of the frame I. This shaft is offset in its middle portion 29 on which is set, by means of needle bearings, a nut head' 30 (Figure 9) in the boring of which is housed the fixed nut 3| on which is keyed the handwheel 32 that controls the movement of the driving .carriage 6 by actuating the fixed nut 3! that works together with a micrometric control screw 33 that is caused to move together with the bearing 34 on which the screw is attached and consequently with the driving carriage 6, to which is fastened the said bearing 34.

Set up in this way, according to the diameter of the shouldered piece to be trued by dipping, the driving abrasive wheel "I may be brought close by moving its carriage 6 through the working of the hand wheel 32 by a distance near the truing diameter to be obtained by carrying out successi ve truing trials until the required value of diameter is obtained. When this adjustment is made by the hand wheel, it should be left unaltered andthe intermittent operations are carried out by working the lever 28 that moves simultaneously, through a turning of the above described offset shaft 29, the assembly including the abrasive wheel, carriage, etc. through the agency of the nut head 30 set on the eccentric portion 29 by means of needle bearings that damp down the repeated reciprocating motions. Through this eccentric form of control the untimely and very harmful wear is avoided of the micrometer screw 33, thatis. certain to take place if the (lips were controlled by working the handwheel 32.

Referring to the control for ejection of the work pieces when truing by intermittent operations, there is. keyed on the. end of the shaft 29 a small control plate 35 that drives a. ring 36 at the periphery of which is cut a. spiral groove. Said. groove engages for cooperation a. bearing member 31. running on a. bearing surface of the link 3.8 that is itselfcentered. and pinned on a transmission shaft 39. The latter is centered in inner bearing surfaces of the frame 1 and carries centered and pinned on its other end a linkrod 40 placed side by side with respect to an identical small rod 40 (Figure 18), the two rods being angularly rigid with one another through a driving screw 4| engaged in the wristpins of the said small rods; but the small rod 411 is pinned and centered on the end of a shaft 42 in alignment with the shaft 39, the said shaft 42 being axially carried by the ejector support 43 fastened on the support of the guide-bars 44 (Figure 17) On the'end of the shaft 42 is keyed a ratchet 45 that drives, by striking against a pawl 46, the actuating lever 41 turningfreely on a bearing surface of the ratchet 45; the said lever is submitted to the action of two spiral tension return springs 48; the actuating lever 41 draws in itsrearward turning movement the pawl 49 of the piston 50 into which is screwed the threaded rod 51 having an adjustable amount of projection and acting as a stop and ejector for the trued work pieces. A spring 52 ensures the return of the piston of the ejector rod backwards after release; from the actuating. lever.

It follows as a result of this arrangement that by working the lever 28' the dip of the driving abrasive wheel is controlled and by means of the spirally grooved ring, the small rods and shafts, there is a simultaneous control of the return of the control-lever 41 that then picks up the pawl 49, when the truing, has been carried out; the pawl 45 of. the control-lever is disengaged from the ratchet 45 by abutting against the adjustablescrew 53, the control-lever 41 is freed and subjected to the sharp forward return of the springs-48 while drawing along'through the pawl 49 the piston- 50 and the threaded rod 51 that ejects the trued piece.

Control of the speed-changer (Figures 21 and 22) and speed-change box for the driving abrasive wheel during the running; of the machine (Figures 11, 12, 13).

According to the variations in working conditions for truing, it is requisite'to obtain a great difference in. speeds for the pieces to be trued. It is with this object in-view that the speed of the control: motor 54' (Figure: 2) is. transmitted to a speed-changer 55-fastened to the frame and that presents a primary range of speed changes. The motion is transmitted through a toothed pinion andchain 56 to the-.gear-box fastenedby itswcasingv 51 on to the framev (Figures, 11, 12, .13). Th .motion. is taken by the toothed pinion 58 centered and keyed on the primary shaft carrying a s'mallpinion at 58" and provided with a keyed pinion 59 adapted to engage a toothed member of the sliding gear 60 that moves on the secondary grooved. shaft Bl through the working of the control lever 62. The latter actuates a small rod moving the fork 53 and consequently the sliding gear 60. It is obvious that if the sliding gear 60' engages with 58 the speed taken by the pinion 58 is decreased and the speeds for truing work are maintained, while when the sliding gear is engaged with the gear 59, the speed received is increased which corresponds to the setting speeds of the abrasive wheel. The speed of' the secondary shaft 6| is transmitted to a counter shaft 6'4 through bevel gears; A gear 65 is keyed on the counter shaft that engages with a chain 66 that transmits the speed to the control gear 61' of the driving spindle of the abrasive wheel 1, the chain 66 being tightened and sent over the chain tightening device (Figures 29-30) made up of two toothed pinions 53 and 53; the gear 69 is centered on an arm of a hub 11 also centered; on the tightener spindle 1i) and of which another arm is subjected to the action of a tensioning spring 12.

A handwheel 13 enables the control to be effeoted of the speed changer 55 (Figures 21 and 22). This handwheel is keyed on a transmission shaft 14 centered and carried, through the agency of bearings and ball-races, in the walls of the frame 1. A set of bevel-gears 15-15' ensures the link up with the speed-change 55. The indications of the movements of the handwheel 13 and consequently of the control of the gear-change are transmitted through the gear 16 and. planetwheel 11 engaged with the sun-wheel 18, the latter being fixed rigidly with a rotary Vernier 1'9 onwhich are read the indications desired.

Through, the gear-change and the speed-box, an. extensive range of speeds is obtained for the driving abrasive wheel, ranging from 1''! to 600 R. P. M1, which enables a suitable speed to be attained'in the various cases and for the best rate. of working.

6. Movable guide-rests for truing in series (Figures 14-15) and supporting device for the movable guide rests and for control of the raising of guide-bars (Figure 16). p

The movable guide-rests are used for the work of truing in series, that is to say when the pieces to be trued flow in a continuous way between the abrasive wheels. These are provided with two identical pairs of guide rests. Each pair includes two guide-rests and 80 of which the'lower bearing surfaces 8! interengage over a hinge pin and are hollowed out half way round to enable the guide-rests to be. quickly put into position on the machine by merely placing them on the hinge shaft or to withdraw them just as easily. In their upper portion through clamping rods and supporting dovetail bars, the guide-rests hold the seriesguides 82 of suitably treated steel against which slide the work pieces during the truing. According to the diameter of the pieces to be trued, the bringing nearer or drawing apart of the guides 82 is carried out through a movement of the guide-rests 80-430 by operating the milled knobs 83 that work together with the eye-bolts 84 turning on a spindle 85'fastened to the support of. the guide-bars; the milled knobs 83 act on a bearing surface 86 of the guide rests through the agency of rings bearing through their journals in.n otches;of the bearing'surfaces 86.

According to the work pieces to be trued, it is 

